could you be hearing the drive shaft clunking?
+1check panhard bar bolt torque. If not clamped tight the bolt rattles in the bushing sleeve. Ask me how i know.
Hi Brian505,The sound is similar to a strut bearing rattle or clunk when they are shot, but its coming from the rear of the car. Exhaust and mufflers are not the culprits. Any ideas of what to check would be a help.